<script src="js/jquery.blockUI.js"></script>
<div id="preguntaModalDiv" style="display:none">
<script>
function cancelarPregunta(){
	$.unblockUI();
}
</script>
<div style="color:red; height:30px;font-size:15px;" id="preguntaSTR"></div>
<br>
<button class="btn btn-small" id="btnConfirmaPregunta" onclick="">Si</button>
<button class="btn btn-small" id="btnNO" onclick="cancelarPregunta()">No</button>
</div>